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Looking forward to your 'finding's.
With the slow moving bullets, a slightly higher vel. should bring the elevation down somewhat, without hurting the regulation - maybe?
I am sure the gun smith meant "lower" rear sight.

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That will certainly be the case Tony as Daryl has described!
A small change in velocity can have quite a large difference in impact point, even a powder change can vary group size & shape remarkably; so just a small tweak might be all you need to get velocity up & your new Chrissy present on target without playing with the sights!
Best of luck mate!